def no_teen_sum(a, b, c):
  if (a) in [13, 14, 17, 18, 19] and (a) != [15, 16]:
      a=0
  if (b) in [13, 14, 17, 18, 19] and (b) != [15, 16]:
      b=0
  if (c) in [13, 14, 17, 18, 19] and (c) != [15, 16]:
     c=0
  return a+b+c